Zodiac Spot On Plus Flea & Tick Control for Cats Over 5 lbs. kills fleas and deer ticks for up to 1 month. Kills and repels mosquitoes for up to 18 days.Kills flea eggs for up to 1 month. Stops the flea life cycle and prevents reinfestation. Pet Specifix applicator shape helps prevent misuse on dogs. Longer tip makes application easy - even in long hair.